1 /* ldlang.h - linker command language support 2 Copyright (C) 1991-2018 Free Software Foundation, Inc. 3 4 This file is part of the GNU Binutils. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 19 MA 02110-1301, USA. */ 20 21 #ifndef LDLANG_H 22 #define LDLANG_H 23 24 #define DEFAULT_MEMORY_REGION "*default*" 25 26 typedef enum 27 { 28 lang_input_file_is_l_enum, 29 lang_input_file_is_symbols_only_enum, 30 lang_input_file_is_marker_enum, 31 lang_input_file_is_fake_enum, 32 lang_input_file_is_search_file_enum, 33 lang_input_file_is_file_enum 34 } lang_input_file_enum_type; 35 36 struct _fill_type 37 { 38 size_t size; 39 unsigned char data[1]; 40 }; 41 42 typedef struct statement_list 43 { 44 union lang_statement_union * head; 45 union lang_statement_union ** tail; 46 } lang_statement_list_type; 47 48 typedef struct memory_region_name_struct 49 { 50 const char * name; 51 struct memory_region_name_struct * next; 52 } lang_memory_region_name; 53 54 typedef struct memory_region_struct 55 { 56 lang_memory_region_name name_list; 57 struct memory_region_struct *next; 58 union etree_union *origin_exp; 59 bfd_vma origin; 60 bfd_size_type length; 61 union etree_union *length_exp; 62 bfd_vma current; 63 union lang_statement_union *last_os; 64 flagword flags; 65 flagword not_flags; 66 bfd_boolean had_full_message; 67 } lang_memory_region_type; 68 69 enum statement_enum 70 { 71 lang_output_section_statement_enum, 72 lang_assignment_statement_enum, 73 lang_input_statement_enum, 74 lang_address_statement_enum, 75 lang_wild_statement_enum, 76 lang_input_section_enum, 77 lang_object_symbols_statement_enum, 78 lang_fill_statement_enum, 79 lang_data_statement_enum, 80 lang_reloc_statement_enum, 81 lang_target_statement_enum, 82 lang_output_statement_enum, 83 lang_padding_statement_enum, 84 lang_group_statement_enum, 85 lang_insert_statement_enum, 86 lang_constructors_statement_enum 87 }; 88 89 typedef struct lang_statement_header_struct 90 { 91 union lang_statement_union *next; 92 enum statement_enum type; 93 } lang_statement_header_type; 94 95 typedef struct 96 { 97 lang_statement_header_type header; 98 union etree_union *exp; 99 } lang_assignment_statement_type; 100 101 typedef struct lang_target_statement_struct 102 { 103 lang_statement_header_type header; 104 const char *target; 105 } lang_target_statement_type; 106 107 typedef struct lang_output_statement_struct 108 { 109 lang_statement_header_type header; 110 const char *name; 111 } lang_output_statement_type; 112 113 /* Section types specified in a linker script. */ 114 115 enum section_type 116 { 117 normal_section, 118 overlay_section, 119 noload_section, 120 noalloc_section 121 }; 122 123 /* This structure holds a list of program headers describing 124 segments in which this section should be placed. */ 125 126 typedef struct lang_output_section_phdr_list 127 { 128 struct lang_output_section_phdr_list *next; 129 const char *name; 130 bfd_boolean used; 131 } lang_output_section_phdr_list; 132 133 typedef struct lang_output_section_statement_struct 134 { 135 lang_statement_header_type header; 136 lang_statement_list_type children; 137 struct lang_output_section_statement_struct *next; 138 struct lang_output_section_statement_struct *prev; 139 const char *name; 140 asection *bfd_section; 141 lang_memory_region_type *region; 142 lang_memory_region_type *lma_region; 143 fill_type *fill; 144 union etree_union *addr_tree; 145 union etree_union *load_base; 146 147 /* If non-null, an expression to evaluate after setting the section's 148 size. The expression is evaluated inside REGION (above) with '.' 149 set to the end of the section. Used in the last overlay section 150 to move '.' past all the overlaid sections. */ 151 union etree_union *update_dot_tree; 152 153 lang_output_section_phdr_list *phdrs; 154 155 unsigned int block_value; 156 int subsection_alignment; /* Alignment of components. */ 157 int section_alignment; /* Alignment of start of section. */ 158 int constraint; 159 flagword flags; 160 enum section_type sectype; 161 unsigned int processed_vma : 1; 162 unsigned int processed_lma : 1; 163 unsigned int all_input_readonly : 1; 164 /* If this section should be ignored. */ 165 unsigned int ignored : 1; 166 /* If this section should update "dot". Prevents section being ignored. */ 167 unsigned int update_dot : 1; 168 /* If this section is after assignment to _end. */ 169 unsigned int after_end : 1; 170 /* If this section uses the alignment of its input sections. */ 171 unsigned int align_lma_with_input : 1; 172 } lang_output_section_statement_type; 173 174 typedef struct 175 { 176 lang_statement_header_type header; 177 } lang_common_statement_type; 178 179 typedef struct 180 { 181 lang_statement_header_type header; 182 } lang_object_symbols_statement_type; 183 184 typedef struct 185 { 186 lang_statement_header_type header; 187 fill_type *fill; 188 int size; 189 asection *output_section; 190 } lang_fill_statement_type; 191 192 typedef struct 193 { 194 lang_statement_header_type header; 195 unsigned int type; 196 union etree_union *exp; 197 bfd_vma value; 198 asection *output_section; 199 bfd_vma output_offset; 200 } lang_data_statement_type; 201 202 /* Generate a reloc in the output file. */ 203 204 typedef struct 205 { 206 lang_statement_header_type header; 207 208 /* Reloc to generate. */ 209 bfd_reloc_code_real_type reloc; 210 211 /* Reloc howto structure. */ 212 reloc_howto_type *howto; 213 214 /* Section to generate reloc against. 215 Exactly one of section and name must be NULL. */ 216 asection *section; 217 218 /* Name of symbol to generate reloc against. 219 Exactly one of section and name must be NULL. */ 220 const char *name; 221 222 /* Expression for addend. */ 223 union etree_union *addend_exp; 224 225 /* Resolved addend. */ 226 bfd_vma addend_value; 227 228 /* Output section where reloc should be performed. */ 229 asection *output_section; 230 231 /* Offset within output section. */ 232 bfd_vma output_offset; 233 } lang_reloc_statement_type; 234 235 struct lang_input_statement_flags 236 { 237 /* 1 means this file was specified in a -l option. */ 238 unsigned int maybe_archive : 1; 239 240 /* 1 means this file was specified in a -l:namespec option. */ 241 unsigned int full_name_provided : 1; 242 243 /* 1 means search a set of directories for this file. */ 244 unsigned int search_dirs : 1; 245 246 /* 1 means this was found when processing a script in the sysroot. */ 247 unsigned int sysrooted : 1; 248 249 /* 1 means this is base file of incremental load. 250 Do not load this file's text or data. 251 Also default text_start to after this file's bss. */ 252 unsigned int just_syms : 1; 253 254 /* Whether to search for this entry as a dynamic archive. */ 255 unsigned int dynamic : 1; 256 257 /* Set if a DT_NEEDED tag should be added not just for the dynamic library 258 explicitly given by this entry but also for any dynamic libraries in 259 this entry's needed list. */ 260 unsigned int add_DT_NEEDED_for_dynamic : 1; 261 262 /* Set if this entry should cause a DT_NEEDED tag only when some 263 regular file references its symbols (ie. --as-needed is in effect). */ 264 unsigned int add_DT_NEEDED_for_regular : 1; 265 266 /* Whether to include the entire contents of an archive. */ 267 unsigned int whole_archive : 1; 268 269 /* Set when bfd opening is successful. */ 270 unsigned int loaded : 1; 271 272 unsigned int real : 1; 273 274 /* Set if the file does not exist. */ 275 unsigned int missing_file : 1; 276 277 /* Set if reloading an archive or --as-needed lib. */ 278 unsigned int reload : 1; 279 280 #ifdef ENABLE_PLUGINS 281 /* Set if the file was claimed by a plugin. */ 282 unsigned int claimed : 1; 283 284 /* Set if the file was claimed from an archive. */ 285 unsigned int claim_archive : 1; 286 287 /* Set if added by the lto plugin add_input_file callback. */ 288 unsigned int lto_output : 1; 289 #endif /* ENABLE_PLUGINS */ 290 291 /* Head of list of pushed flags. */ 292 struct lang_input_statement_flags *pushed; 293 }; 294 295 typedef struct lang_input_statement_struct 296 { 297 lang_statement_header_type header; 298 /* Name of this file. */ 299 const char *filename; 300 /* Name to use for the symbol giving address of text start. 301 Usually the same as filename, but for a file spec'd with 302 -l this is the -l switch itself rather than the filename. */ 303 const char *local_sym_name; 304 305 bfd *the_bfd; 306 307 struct flag_info *section_flag_list; 308 309 /* Point to the next file - whatever it is, wanders up and down 310 archive elements. If this input_statement is for an archive, it 311 won't be on file_chain (which uses this list pointer), but if 312 any elements have been extracted from the archive, it will point 313 to the input_statement for the last such element. */ 314 union lang_statement_union *next; 315 316 /* Point to the next file, but skips archive contents. Used by 317 input_file_chain. */ 318 union lang_statement_union *next_real_file; 319 320 const char *target; 321 322 struct lang_input_statement_flags flags; 323 } lang_input_statement_type; 324 325 typedef struct 326 { 327 lang_statement_header_type header; 328 asection *section; 329 } lang_input_section_type; 330 331 struct map_symbol_def { 332 struct bfd_link_hash_entry *entry; 333 struct map_symbol_def *next; 334 }; 335 336 /* For input sections, when writing a map file: head / tail of a linked 337 list of hash table entries for symbols defined in this section. */ 338 typedef struct input_section_userdata_struct 339 { 340 struct map_symbol_def *map_symbol_def_head; 341 struct map_symbol_def **map_symbol_def_tail; 342 unsigned long map_symbol_def_count; 343 } input_section_userdata_type; 344 345 #define get_userdata(x) ((x)->userdata) 346 347 348 typedef struct lang_wild_statement_struct lang_wild_statement_type; 349 350 typedef void (*callback_t) (lang_wild_statement_type *, struct wildcard_list *, 351 asection *, struct flag_info *, 352 lang_input_statement_type *, void *); 353 354 typedef void (*walk_wild_section_handler_t) (lang_wild_statement_type *, 355 lang_input_statement_type *, 356 callback_t callback, 357 void *data); 358 359 typedef bfd_boolean (*lang_match_sec_type_func) (bfd *, const asection *, 360 bfd *, const asection *); 361 362 /* Binary search tree structure to efficiently sort sections by 363 name. */ 364 typedef struct lang_section_bst 365 { 366 asection *section; 367 struct lang_section_bst *left; 368 struct lang_section_bst *right; 369 } lang_section_bst_type; 370 371 struct lang_wild_statement_struct 372 { 373 lang_statement_header_type header; 374 const char *filename; 375 bfd_boolean filenames_sorted; 376 struct wildcard_list *section_list; 377 bfd_boolean keep_sections; 378 lang_statement_list_type children; 379 struct name_list *exclude_name_list; 380 381 walk_wild_section_handler_t walk_wild_section_handler; 382 struct wildcard_list *handler_data[4]; 383 lang_section_bst_type *tree; 384 struct flag_info *section_flag_list; 385 }; 386 387 typedef struct lang_address_statement_struct 388 { 389 lang_statement_header_type header; 390 const char *section_name; 391 union etree_union *address; 392 const segment_type *segment; 393 } lang_address_statement_type; 394 395 typedef struct 396 { 397 lang_statement_header_type header; 398 bfd_vma output_offset; 399 bfd_size_type size; 400 asection *output_section; 401 fill_type *fill; 402 } lang_padding_statement_type; 403 404 /* A group statement collects a set of libraries together. The 405 libraries are searched multiple times, until no new undefined 406 symbols are found. The effect is to search a group of libraries as 407 though they were a single library. */ 408 409 typedef struct 410 { 411 lang_statement_header_type header; 412 lang_statement_list_type children; 413 } lang_group_statement_type; 414 415 typedef struct 416 { 417 lang_statement_header_type header; 418 const char *where; 419 bfd_boolean is_before; 420 } lang_insert_statement_type; 421 422 typedef union lang_statement_union 423 { 424 lang_statement_header_type header; 425 lang_wild_statement_type wild_statement; 426 lang_data_statement_type data_statement; 427 lang_reloc_statement_type reloc_statement; 428 lang_address_statement_type address_statement; 429 lang_output_section_statement_type output_section_statement; 430 lang_assignment_statement_type assignment_statement; 431 lang_input_statement_type input_statement; 432 lang_target_statement_type target_statement; 433 lang_output_statement_type output_statement; 434 lang_input_section_type input_section; 435 lang_common_statement_type common_statement; 436 lang_object_symbols_statement_type object_symbols_statement; 437 lang_fill_statement_type fill_statement; 438 lang_padding_statement_type padding_statement; 439 lang_group_statement_type group_statement; 440 lang_insert_statement_type insert_statement; 441 } lang_statement_union_type; 442 443 /* This structure holds information about a program header, from the 444 PHDRS command in the linker script. */ 445 446 struct lang_phdr 447 { 448 struct lang_phdr *next; 449 const char *name; 450 unsigned long type; 451 bfd_boolean filehdr; 452 bfd_boolean phdrs; 453 etree_type *at; 454 etree_type *flags; 455 }; 456 457 /* This structure is used to hold a list of sections which may not 458 cross reference each other. */ 459 460 typedef struct lang_nocrossref 461 { 462 struct lang_nocrossref *next; 463 const char *name; 464 } lang_nocrossref_type; 465 466 /* The list of nocrossref lists. */ 467 468 struct lang_nocrossrefs 469 { 470 struct lang_nocrossrefs *next; 471 lang_nocrossref_type *list; 472 bfd_boolean onlyfirst; 473 }; 474 475 /* This structure is used to hold a list of input section names which 476 will not match an output section in the linker script. */ 477 478 struct unique_sections 479 { 480 struct unique_sections *next; 481 const char *name; 482 }; 483 484 /* Used by place_orphan to keep track of orphan sections and statements. */ 485 486 struct orphan_save 487 { 488 const char *name; 489 flagword flags; 490 lang_output_section_statement_type *os; 491 asection **section; 492 lang_statement_union_type **stmt; 493 lang_output_section_statement_type **os_tail; 494 }; 495 496 struct asneeded_minfo 497 { 498 struct asneeded_minfo *next; 499 const char *soname; 500 bfd *ref; 501 const char *name; 502 }; 503 504 extern struct lang_phdr *lang_phdr_list; 505 extern struct lang_nocrossrefs *nocrossref_list; 506 extern const char *output_target; 507 extern lang_output_section_statement_type *abs_output_section; 508 extern lang_statement_list_type lang_output_section_statement; 509 extern struct lang_input_statement_flags input_flags; 510 extern bfd_boolean lang_has_input_file; 511 extern lang_statement_list_type *stat_ptr; 512 extern bfd_boolean delete_output_file_on_failure; 513 514 extern struct bfd_sym_chain entry_symbol; 515 extern const char *entry_section; 516 extern bfd_boolean entry_from_cmdline; 517 extern lang_statement_list_type file_chain; 518 extern lang_statement_list_type input_file_chain; 519 520 extern int lang_statement_iteration; 521 extern struct asneeded_minfo **asneeded_list_tail; 522 523 extern void (*output_bfd_hash_table_free_fn) (struct bfd_link_hash_table *); 524 525 extern void lang_init 526 (void); 527 extern void lang_finish 528 (void); 529 extern lang_memory_region_type * lang_memory_region_lookup 530 (const char * const, bfd_boolean); 531 extern void lang_memory_region_alias 532 (const char *, const char *); 533 extern void lang_map 534 (void); 535 extern void lang_set_flags 536 (lang_memory_region_type *, const char *, int); 537 extern void lang_add_output 538 (const char *, int from_script); 539 extern lang_output_section_statement_type *lang_enter_output_section_statement 540 (const char *, etree_type *, enum section_type, etree_type *, etree_type *, 541 etree_type *, int, int); 542 extern void lang_final 543 (void); 544 extern void lang_relax_sections 545 (bfd_boolean); 546 extern void lang_process 547 (void); 548 extern void lang_section_start 549 (const char *, union etree_union *, const segment_type *); 550 extern void lang_add_entry 551 (const char *, bfd_boolean); 552 extern void lang_default_entry 553 (const char *); 554 extern void lang_add_target 555 (const char *); 556 extern void lang_add_wild 557 (struct wildcard_spec *, struct wildcard_list *, bfd_boolean); 558 extern void lang_add_map 559 (const char *); 560 extern void lang_add_fill 561 (fill_type *); 562 extern lang_assignment_statement_type *lang_add_assignment 563 (union etree_union *); 564 extern void lang_add_attribute 565 (enum statement_enum); 566 extern void lang_startup 567 (const char *); 568 extern void lang_float 569 (bfd_boolean); 570 extern void lang_leave_output_section_statement 571 (fill_type *, const char *, lang_output_section_phdr_list *, 572 const char *); 573 extern void lang_statement_append 574 (lang_statement_list_type *, lang_statement_union_type *, 575 lang_statement_union_type **); 576 extern void lang_for_each_input_file 577 (void (*dothis) (lang_input_statement_type *)); 578 extern void lang_for_each_file 579 (void (*dothis) (lang_input_statement_type *)); 580 extern void lang_reset_memory_regions 581 (void); 582 extern void lang_do_assignments 583 (lang_phase_type); 584 extern asection *section_for_dot 585 (void); 586 587 #define LANG_FOR_EACH_INPUT_STATEMENT(statement) \ 588 lang_input_statement_type *statement; \ 589 for (statement = &file_chain.head->input_statement; \ 590 statement != NULL; \ 591 statement = &statement->next->input_statement) 592 593 #define lang_output_section_find(NAME) \ 594 lang_output_section_statement_lookup (NAME, 0, FALSE) 595 596 extern void lang_process 597 (void); 598 extern void ldlang_add_file 599 (lang_input_statement_type *); 600 extern lang_output_section_statement_type *lang_output_section_find_by_flags 601 (const asection *, flagword, lang_output_section_statement_type **, 602 lang_match_sec_type_func); 603 extern lang_output_section_statement_type *lang_insert_orphan 604 (asection *, const char *, int, lang_output_section_statement_type *, 605 struct orphan_save *, etree_type *, lang_statement_list_type *); 606 extern lang_input_statement_type *lang_add_input_file 607 (const char *, lang_input_file_enum_type, const char *); 608 extern void lang_add_keepsyms_file 609 (const char *); 610 extern lang_output_section_statement_type *lang_output_section_get 611 (const asection *); 612 extern lang_output_section_statement_type *lang_output_section_statement_lookup 613 (const char *, int, bfd_boolean); 614 extern lang_output_section_statement_type *next_matching_output_section_statement 615 (lang_output_section_statement_type *, int); 616 extern void ldlang_add_undef 617 (const char *const, bfd_boolean); 618 extern void ldlang_add_require_defined 619 (const char *const); 620 extern void lang_add_output_format 621 (const char *, const char *, const char *, int); 622 extern void lang_list_init 623 (lang_statement_list_type *); 624 extern void push_stat_ptr 625 (lang_statement_list_type *); 626 extern void pop_stat_ptr 627 (void); 628 extern void lang_add_data 629 (int type, union etree_union *); 630 extern void lang_add_reloc 631 (bfd_reloc_code_real_type, reloc_howto_type *, asection *, const char *, 632 union etree_union *); 633 extern void lang_for_each_statement 634 (void (*) (lang_statement_union_type *)); 635 extern void lang_for_each_statement_worker 636 (void (*) (lang_statement_union_type *), lang_statement_union_type *); 637 extern void *stat_alloc 638 (size_t); 639 extern void strip_excluded_output_sections 640 (void); 641 extern void lang_clear_os_map 642 (void); 643 extern void dprint_statement 644 (lang_statement_union_type *, int); 645 extern void lang_size_sections 646 (bfd_boolean *, bfd_boolean); 647 extern void one_lang_size_sections_pass 648 (bfd_boolean *, bfd_boolean); 649 extern void lang_add_insert 650 (const char *, int); 651 extern void lang_enter_group 652 (void); 653 extern void lang_leave_group 654 (void); 655 extern void lang_add_section 656 (lang_statement_list_type *, asection *, 657 struct flag_info *, lang_output_section_statement_type *); 658 extern void lang_new_phdr 659 (const char *, etree_type *, bfd_boolean, bfd_boolean, etree_type *, 660 etree_type *); 661 extern void lang_add_nocrossref 662 (lang_nocrossref_type *); 663 extern void lang_add_nocrossref_to 664 (lang_nocrossref_type *); 665 extern void lang_enter_overlay 666 (etree_type *, etree_type *); 667 extern void lang_enter_overlay_section 668 (const char *); 669 extern void lang_leave_overlay_section 670 (fill_type *, lang_output_section_phdr_list *); 671 extern void lang_leave_overlay 672 (etree_type *, int, fill_type *, const char *, 673 lang_output_section_phdr_list *, const char *); 674 675 extern struct bfd_elf_version_expr *lang_new_vers_pattern 676 (struct bfd_elf_version_expr *, const char *, const char *, bfd_boolean); 677 extern struct bfd_elf_version_tree *lang_new_vers_node 678 (struct bfd_elf_version_expr *, struct bfd_elf_version_expr *); 679 extern struct bfd_elf_version_deps *lang_add_vers_depend 680 (struct bfd_elf_version_deps *, const char *); 681 extern void lang_register_vers_node 682 (const char *, struct bfd_elf_version_tree *, struct bfd_elf_version_deps *); 683 extern void lang_append_dynamic_list (struct bfd_elf_version_expr *); 684 extern void lang_append_dynamic_list_cpp_typeinfo (void); 685 extern void lang_append_dynamic_list_cpp_new (void); 686 extern void lang_add_unique 687 (const char *); 688 extern const char *lang_get_output_target 689 (void); 690 extern void add_excluded_libs (const char *); 691 extern bfd_boolean load_symbols 692 (lang_input_statement_type *, lang_statement_list_type *); 693 694 extern bfd_boolean 695 ldlang_override_segment_assignment 696 (struct bfd_link_info *, bfd *, asection *, asection *, bfd_boolean); 697 698 extern void 699 lang_ld_feature (char *); 700 701 extern void 702 lang_print_memory_usage (void); 703 704 extern void 705 lang_add_gc_name (const char *); 706 707 #endif 708